My turn for help with Pulse multiplier for test rig.

[Robin Hewitt]

Fit a hand crank to the rear stub shaft of the stepper motor.

That works on so many levels, a complete solution, I am truly in awe

[Neale]

That works on so many levels, a complete solution, I am truly in awe

Almost, but not quite. It just needs a solenoid-operated lever to give the user a slap on the wrist when the limit switch is triggered.

[Robin Hewitt]

Almost, but not quite. It just needs a solenoid-operated lever to give the user a slap on the wrist when the limit switch is triggered.

Like me you are forgetting Gotama's advice to Siddhartha... "Beware of too much cleverness".

[EddyCurrent]

When I was about 20 years old my work colleagues presented me with the (fictitious) Duke of Edinburgh Award for 'Use of Stone Age Tools'.

[EddyCurrent]

Almost, but not quite. It just needs a solenoid-operated lever to give the user a slap on the wrist when the limit switch is triggered.

Or, when the handle stops turning, you've hit the end stops.

[irving2008]

OK, here's version 0.1 for discussion....

[Jonathan]

Tbh my approach just generates n pulses for each wheel pulse at a rate that's fast enough to finish before the next wheel pulse.

As touched upon earlier, the 'jitter' this adds to the pulse stream will reduce the maximum feedrate somewhat as the motors wont run as smoothly. How much is hard to say, but it could be a problem...

OK, here's version 0.1 for discussion....

Direction required?

[JohnHaine]

More and more it looks to me that the best approach is a mechanical step-up! Trying to multiply the number of pulses electronically is inherently the wrong way to go.

[JohnHaine]

Fix the mpg down on a board and mount a larger mdf wheel next to it on an improvised pivot. Use a wide rubber band as a belt . Should be relatively easy to get a 5:1 step up.

[Jonathan]

Fix the mpg down on a board and mount a larger mdf wheel next to it on an improvised pivot. Use a wide rubber band as a belt . Should be relatively easy to get a 5:1 step up.

Better still, connect the rubber band to the stepper motor to get a closed loop system. I'm sure you'd get positive feedback for that idea ;)